3. Diagnosis of AML [other than acute promyelocytic leukemia (APL)] with refractory/relapsed disease. Patients with newly diagnosed AML will be eligible if not a candidate for intensive chemotherapy. Patients with high-risk (intermediate-2 or high by IPSS or >/=10% blasts) MDS will also be eligible. Patients with chronic myeloid leukemia (CML) in blast crisis will be eligible as well.